From: Bernd Schmidt <bernds@codesourcery.com>
Date: Wed, 17 Feb 2016 13:03:44 +0000 (+0000)
Subject: Backport PR69752 fix from mainline.
X-Git-Tag: releases/gcc-4.9.4~318
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f7161456fad7b0d1a59a8b8ab78e96bd6697fcd8;p=thirdparty%2Fgcc.git

Backport PR69752 fix from mainline.

	PR rtl-optimization/69752
	* ira.c (update_equiv_regs): When looking for more than a single SET,
	also take other side effects into account.

From-SVN: r233491
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b82a7f382956..b6c2cc7f3156 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,12 @@
+2016-02-16  Bernd Schmidt  <bernds@codesourcery.com>
+
+	Backport from mainline
+	2016-02-15  Bernd Schmidt  <bschmidt@redhat.com>
+
+	PR rtl-optimization/69752
+	* ira.c (update_equiv_regs): When looking for more than a single SET,
+	also take other side effects into account.
+
 2016-02-16  Tom de Vries  <tom@codesourcery.com>
 
 	backport from trunk:
diff --git a/gcc/ira.c b/gcc/ira.c
index 544dbf76f872..4741d6fa1bbd 100644
--- a/gcc/ira.c
+++ b/gcc/ira.c
@@ -3510,7 +3510,8 @@ update_equiv_regs (void)
 
 	  /* If this insn contains more (or less) than a single SET,
 	     only mark all destinations as having no known equivalence.  */
-	  if (set == 0)
+	  if (set == 0
+	      || side_effects_p (SET_SRC (set)))
 	    {
 	      note_stores (PATTERN (insn), no_equiv, NULL);
 	      continue;